package com.xxl.job.core.util;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;

/**
 * @author xuxueli
 * @since 2020-04-11 20:56:31
 */
public class GsonTool {

	private static Gson gson = null;
	static {
		gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
	}

	/**
	 * Object 转成 json
	 * @param src
	 * @return String
	 */
	public static String toJson(Object src) {
		return gson.toJson(src);
	}

	/**
	 * json 转成 特定的cls的Object
	 * @param json
	 * @param classOfT
	 * @return
	 */
	public static <T> T fromJson(String json, Class<T> classOfT) {
		return gson.fromJson(json, classOfT);
	}

	/**
	 * json 转成 特定的 rawClass<classOfT> 的Object
	 * @param json
	 * @param classOfT
	 * @param argClassOfT
	 * @return
	 */
	public static <T> T fromJson(String json, Class<T> classOfT, Class argClassOfT) {
		Type type = new ParameterizedType4ReturnT(classOfT, new Class[] { argClassOfT });
		return gson.fromJson(json, type);
	}

	public static class ParameterizedType4ReturnT implements ParameterizedType {

		private final Class raw;

		private final Type[] args;

		public ParameterizedType4ReturnT(Class raw, Type[] args) {
			this.raw = raw;
			this.args = args != null ? args : new Type[0];
		}

		@Override
		public Type[] getActualTypeArguments() {
			return args;
		}

		@Override
		public Type getRawType() {
			return raw;
		}

		@Override
		public Type getOwnerType() {
			return null;
		}

	}

	/**
	 * json 转成 特定的cls的list
	 * @param json
	 * @param classOfT
	 * @return
	 */
	public static <T> List<T> fromJsonList(String json, Class<T> classOfT) {
		return gson.fromJson(json, new TypeToken<List<T>>() {
		}.getType());
	}

}
